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</p> </div> <div class="bottom-of-entry"> </div> </li> <li id="prologue-2102" class="post-2102 post type-post status-publish format-standard hentry category-science category-technology tag-math tag-science"> <a href="http://kevinchiu.org/archives/author/kevin" title="Posts by Kevin Chiu ( @kevin )"> </a> <h4> <a href="http://kevinchiu.org/archives/author/kevin" title="Posts by Kevin Chiu ( @kevin )">Kevin Chiu</a> <span class="meta"> <abbr title="2011-04-10T02:59:26Z">9:59 pm <em>on</em> April 9, 2011</abbr> <span class="actions"> <a href="http://kevinchiu.org/archives/in-which-i-try-to-teach-ken-perlin-about-something-he-invented" class="thepermalink">Permalink</a> | <a rel='nofollow' class='comment-reply-link' href='http://kevinchiu.org/archives/in-which-i-try-to-teach-ken-perlin-about-something-he-invented#respond' onclick='return addComment.moveForm("prologue-2102", "0", "respond", "2102")'>Reply</a> </span> <span class="tags"> <br />Tags: math, <a href="http://kevinchiu.org/archives/tag/science" rel="tag">Science ( 3 )</a> </span> </span> </h4> <div id="content-2102" class="postcontent"> <p>I was recently speaking with <a href="http://kenperlin.com">Ken Perlin</a> regarding fast face tracking code. When he spoke of how his tracker matched on every frame using separate sums of horizontal and vertical pixels (compressed into columns and rows respectively), it reminded me of <a href="http://en.wikipedia.org/wiki/Summed_area_table">Integral Images</a> in the <a href="http://research.microsoft.com/~viola/Pubs/Detect/violaJones_IJCV.pdf">Viola Jones</a> algorithm.</p> <p>I proceeded to enlighten the person who pioneered their use in computer graphics… <strong>Oops!</strong></p> </div> <div class="bottom-of-entry"> </div> </li> <li id="prologue-1511" class="post-1511 post type-post status-publish format-standard hentry category-status tag-music"> <a href="http://kevinchiu.org/archives/author/kevin" title="Posts by Kevin Chiu ( @kevin )"> </a> <h4> <a href="http://kevinchiu.org/archives/author/kevin" title="Posts by Kevin Chiu ( @kevin )">Kevin Chiu</a> <span class="meta"> <abbr title="2011-03-08T12:41:12Z">7:41 am <em>on</em> March 8, 2011</abbr> <span class="actions"> <a href="http://kevinchiu.org/archives/1511" class="thepermalink">Permalink</a> | <a rel='nofollow' class='comment-reply-link' href='http://kevinchiu.org/archives/1511#respond' onclick='return addComment.moveForm("prologue-1511", "0", "respond", "1511")'>Reply</a> </span> <span class="tags"> <br />Tags: <a href="http://kevinchiu.org/archives/tag/music" rel="tag">music ( 3 )</a> </span> </span> </h4> <div id="content-1511" class="postcontent"> <p>These Four Walls</p> <p><iframe title="YouTube video player" width="499" height="311" src="http://www.youtube.com/embed/F7Vc4WeZQ38?rel=0" frameborder="0" allowfullscreen>
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